08/2001
2-1
FEATURES
1.25 Gb/s Differential Output TIA
Automatic Gain Control
Single +5V Supply
1100 MHz Bandwidth
-28 dBm typical sensitivity
On-Chip PIN Photodiode Bias Voltage
APPLICATIONS
Gigabit Ethernet (1.250 Gb/s)
Fibre Channel (1.0625 Gb/s)
PRODUCT DESCRIPTION
Figure 1: ATA121302 Equivalent Circuit
D1C
AGC
Charge
Pump
6.5 GHz
Osc
US Patent: 5047728, 5602510
US Patent Pending
I
IN
V
N
GND
V
DD
V
OUT
V
OUT
4K
The photodetector cathode must be connected to I
IN
and the anode can be connected to V
N
or ground for
proper AGC operation.
The ANADIGICS ATA121302 is a +5V low noise
transimpedance amplifier designed to be used in
Gigabit Ethernet and Fiber Channel fiber optic links.
The device is used in conjunction with a
photodetector (PIN diode or avalanche photodiode)
to convert an optical signal into a differential output
voltage. The ATA121302 offers a bandwidth of
1100MHz, a dynamic range in excess of 28dB and
an on-chip bias voltage for PIN photodetectors. It is
manufactured in a GaAs MESFET process and is
available in bare die form.
ATA121302
1.25Gb/s Transimpedance Amplifier
ADVANCED PRODUCT INFORMATION - Rev 0.1
2
ATA121302
ADVANCED PRODUCT INFORMATION - Rev 0.1
08/2001
Table 1: ATA121302 Pad Description
Figure 2: Bonding Pad Layout
ELECTRICAL CHARACTERISTICS
Table 2: Absolute Maximum Ratings
D
A
P
N
O
I
T
P
I
R
C
S
E
D
T
N
E
M
M
O
C
D
D
V
e
g
a
tl
o
V
y
l
p
p
u
S
e
v
it
i
s
o
P
s
tl
o
V
5
+
I
N
I
t
u
p
n
I
A
I
T
n
o
it
a
r
e
p
o
r
e
p
o
r
p
r
o
f
e
d
o
h
t
a
c
r
o
t
c
e
t
e
d
o
t
t
c
e
n
n
o
C
V
N
e
d
o
i
d
o
t
o
h
P
r
o
f
e
g
a
tl
o
V
e
v
it
a
g
e
N
g
n
i
s
a
i
B
e
c
n
a
m
r
o
fr
e
p
m
u
m
it
p
o
r
o
f
e
d
o
n
a
r
o
t
c
e
t
e
d
o
t
t
c
e
n
n
o
C
V
T
U
O
)
d
e
tr
e
v
n
I-
n
o
N
(
e
g
a
tl
o
V
t
u
p
t
u
O
A
I
T
t
u
p
n
i
l
a
c
it
p
o
h
ti
w
'
1
'
l
a
c
i
g
o
L
V
T
U
O
)
d
e
tr
e
v
n
I(
e
g
a
tl
o
V
t
u
p
t
u
O
A
I
T
t
u
p
n
i
l
a
c
it
p
o
h
ti
w
'
0
'
l
a
c
i
g
o
L
Stresses in excess of the absolute ratings may cause
permanent damage. Functional operation is not implied under
these conditions. Exposure to absolute ratings for extended
periods of time may adversely affect reliability.
V
D
D
V
0
.
7
I
N
I
A
m
5
.
3
T
S
5
6
-
.
p
m
e
T
e
g
a
r
o
t
S
0
5
2
1
o
t
C
0
C
3
ADVANCED PRODUCT INFORMATION - Rev 0.1
08/2001
ATA121302
Table 3: Electrical Specifications
(1)
(TA= 25
O
C, V
DD
=+5.0V + 10%)
Notes:
1.
Measured with a photodiode having a maximum capacitance of 0.6 pF
and a minimum responsivity of 0.8 A/W.
2.
f = 50 MHz
3.
Measured at 10
10
BER with a 2
7
-1 PRBS, 1.25 Gb/s.
4.
Input optical power = -3 dBm, R
L
= 100 W (differential)
5.
Measured with a 625 MHz, 50% duty cycle square wave.
6.
Measured differentially at -14dBm optical input power.
7.
Measured with a 2
7
-1 PRBS.
8.
1s about the center eye crossing.
9.
6s about the center eye crossing.
R
E
T
E
M
A
R
A
P
N
I
M
P
Y
T
X
A
M
T
I
N
U
)
0
0
1
=
L
R
(
l
a
it
n
e
r
e
ff
i
D
l
a
n
g
i
S
ll
a
m
S
e
c
n
a
t
s
i
s
e
r
s
n
a
r
T
)
2
(
-
8
.
2
-
K
h
t
d
i
w
d
n
a
B
0
0
0
1
0
0
1
1
-
z
H
M
ff
o
t
u
C
y
c
n
e
u
q
e
r
F
w
o
L
-
0
0
8
-
z
H
k
e
c
n
a
t
s
i
s
e
R
t
u
p
n
I
0
0
1
e
c
n
a
t
s
i
s
e
R
t
u
p
t
u
O
-
0
4
-
e
g
a
tl
o
V
t
e
s
ff
O
t
u
p
n
I
-
4
.
1
-
V
e
g
a
tl
o
V
t
e
s
ff
O
t
u
p
t
u
O
-
2
.
2
-
V
V
(
e
g
a
tl
o
V
g
n
i
s
a
i
B
e
d
o
i
d
o
t
o
h
P
N
)
5
-
-
V
d
a
o
lr
e
v
O
l
a
c
it
p
O
)
3
(
,)
1
(
3
-
-
m
B
d
y
ti
v
it
i
s
n
e
S
l
a
c
it
p
O
)
3
(
,)
1
(
-
8
2
-
m
B
d
t
n
e
r
r
u
C
e
s
i
o
N
t
u
p
n
I
-
0
8
2
s
m
r
A
n
e
g
a
tl
o
V
t
u
p
t
u
O
l
a
it
n
e
r
e
ff
i
D
)
5
(
,)
4
(
-
0
5
3
-
V
m
T
E
S
I
R
T
&
L
L
A
F
)
%
0
8
-
0
2
(
)
6
(
,)
5
(
-
0
8
2
-
s
p
n
o
it
r
o
t
s
i
D
e
l
c
y
C
y
t
u
D
)
7
(
,)
4
(
-
4
-
%
r
e
tt
i
J
S
M
R
)
8
(
,)
7
(
,)
4
(
-
0
2
-
s
p
)
k
p
-
k
p
(
r
e
tt
i
J
l
a
t
o
T
)
9
(
,)
7
(
,)
4
(
-
0
0
1
-
s
p
t
n
e
r
r
u
C
y
l
p
p
u
S
-
5
3
-
A
m
e
g
n
a
R
e
g
a
tl
o
V
g
n
it
a
r
e
p
O
5
.
4
+
0
.
5
+
5
.
5
+
V
e
g
n
a
R
e
r
u
t
a
r
e
p
m
e
T
g
n
it
a
r
e
p
O
0
-
5
8
o
C
W
W
W
4
ATA121302
ADVANCED PRODUCT INFORMATION - Rev 0.1
08/2001
Figure 3: ATA 121302 Typical Bonding Diagram
Scribe streets are 37.5mm wide
Figure 4: Frequency Response
0
5
10
15
20
25
30
35
0
500
1000
1500
2000
2500
3000
3500
Frequency (MHz)
Amplitude
(dB)
(Typical Characteristics measured with a photodiode)
PERFORMANCE DATA
5
ADVANCED PRODUCT INFORMATION - Rev 0.1
08/2001
ATA121302
50mV/Div
200ps/Div
Figure 6: Eye Diagram with an Optical Input Power of 17 dBm
200ps/Div
100m
V
/D
iv
Figure 5: Eye Diagram with an Optical Input Power of 3dB
6
ATA121302
ADVANCED PRODUCT INFORMATION - Rev 0.1
08/2001
Figure 7: Supply Current vs. Case Temperature
Figure 8: Bandwidth vs. Case Temperature
20
25
30
35
40
45
0
10
20
30
40
50
60
70
80
90
Case Temperature (C)
S
uppl
y
C
u
rrent
(m
A
)
4.5V
5.0V
5.5V
1040
1060
1080
1100
1120
1140
1160
0
10
20
30
40
50
60
70
80
90
Case Temperature (C)
B
andw
i
d
t
h
(M
H
z
)
4.5V
5.0V
5.5V
Figure 9: Differential Responsivity vs. Temperature
2500
2750
3000
3250
3500
3750
0
10
20
30
40
50
60
70
80
90
Case Temperature (C)
D
i
f
f
e
rent
i
a
l
R
e
s
pons
i
v
i
t
y
(V
/
W
)
4.5V
5.0V
5.5V
Figure 10: Sensitivity vs. Case Temperature
-28.80
-28.60
-28.40
-28.20
-28.00
-27.80
-27.60
-27.40
-27.20
-27.00
0
10
20
30
40
50
60
70
80
90
Case Temperature (C)
S
e
n
s
it
iv
it
y
(
d
B
m
)
4.5V
5.0V
5.5V
7
ADVANCED PRODUCT INFORMATION - Rev 0.1
08/2001
ATA121302
Figure 11: Application Schematic
C
F
is an optional single pole noise filter
f
c
is the desired cutoff frequency
R
= 50 W
R
O
is required with high input resistance limiting amplifiers
R
O
= 100 W
f
c
R
C
F
=
2
1
4K
Charge
Pump
AGC
OUT
OUT
V
DD
4
2
1
3
LIMITING
AMPLIFIER
0.1uF
0.1uF
C
F
R
O
0.1uF
6.5 GHz
OSC
APPLICATION INFORMATION
8
IMPORTANT NOTICE
ANADIGICS, Inc. reserves the right to make changes to its products or to discontinue any product at any time without
notice. The product specifications contained in Advanced Product Information sheets and Preliminary Data Sheets are
subject to change prior to a products formal introduction. Information in Data Sheets have been carefully checked and are
assumed to be reliable; however, ANADIGICS assumes no responsibilities for inaccuracies. ANADIGICS strongly urges
customers to verify that the information they are using is current before placing orders.
WARNING
ANADIGICS products are not intended for use in life support appliances, devices, or systems. Use of an ANADIGICS
product in any such application without written consent is prohibited.
ANADIGICS, Inc.
141 Mount Bethel Road
Warren, New Jersey 07059, U.S.A
Tel: +1 (908) 668-5000
Fax: +1 (908) 668-5132
http://www.anadigics.com
Mktg@anadigics.com
ADVANCED PRODUCT INFORMATION- Rev 0.1
08/2001
ATA121302
ORDERING INFORMATION
R
E
B
M
U
N
T
R
A
P
N
O
I
T
P
O
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G
A
K
C
A
P
N
O
I
T
P
I
R
C
S
E
D
E
G
A
K
C
A
P
C
1
D
2
0
3
1
2
1
A
T
A
1
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i
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